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(No Model.) Sheets-Sheet 1V J. SEDLACEK. GAS COMPRESSOR.

Nan-606,430. Patented June 28, 1898 2 Sheets-Sheet 2. J. SEDLACEK.

GAS COMPRESSOR.

Patented June 28, 1898.

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SPECIFICATION forming part of Letters Iflatent No. 606,430, dated June 28, 1898.

Application mea August 20, 1397. serial No. Maerz'.

(Nomodel'l Patented in vli'rance December 21, 1892, No. 226,556; in

Germany J'anuary13,'1893,No.77,l19; in Austria-Hungary; March 18, 1893,110. 56,187 and No. 86,911, May 6,1893,

No. 1,089 and No. 5,637, and August 30,1893,

No.10,239 and No. 19,809,l in ItalyMarch 28,1893,No.1,1911; in Switzerland July24, 1893, No. 7,363, and ,Tune 25, 1894,110. 8,'798fi11 Belgium August 25,189/1,No.85,843,a11din England May 14,1895, No. 9,530.

T0 all whom t may concern:

Be tknownthat I, JULiUs SEDLACEK, a

subject of the Emperor of Austria-Hungary, residing at Nuremberg, Germany, have invented a new and useful Improvement in Gasp Compressors, of which the `following is a speci- 'iication, and for which the following foreign patents have been granted to me: in Great Britain, No. 9,530, dated May 14, 1895; iny Gerand No. 8,798, dated qJune 25, 1894; in Italy,

No. 1,191, dated March 28, 1893; in Belgium, No. 85,843, dated August 25, 1894, and in Austria-IIungary,No. V5,6, 187 and No. 86, 911,dated March 18, 1893, No. 1,089 and No. 5,637, dated May, 1893, and No. 10,239 and No; 19,809, dated August 30, 1893. Y A

My invention relates to an improvement in the class of compressors for compressing gas (including air) to circulate it, as for the purpose of power or that of refrigeration, in which latter case the improvement would be applied to a refrigerating or ice machine in which is employed the cold-producing property of expanding gas liquefiable under mechanical compression.

My primary object is to prevent leakage of gas from the compressor-chamber about the piston-stem. This I accomplish, generally stated, by providing a chambered stufngbox on the piston beyond the compressorchamber automatically controlled by a regulating-va'lve to maintain in the stuffing-box` chamber a constant or practically constant pressure of the gas which leaks into it from the compressor-chamber, and thereby present to the compressor-chamber to oppose leakage therefrom a gas-pressure adequately great for the purpose, an excess of which, when it occurs, is let out, as into the circulating system,

by overcoming and thus opening the regulating-valve.

My invention consists in the general construction of the apparatus embodying it; and

it also consists in details -of construction and` combinations of parts, all as hereinafter set forth, and pointed out-in theappended claims."

l For the sake of illustration I show my invention as applied to an ice or refrigerating machine and confine the description to that connection, this being the purpose for which I have more particularly devised my invention, though my intention is not to restrict it to that particular: application. V

. 'Referringto Vthe" accompanying drawings, Figure 1 is a longitudinal sectional view of the compressor of anice or refrigerating machine provided with myimprovement. Fig.

2 is a similar enlarged broken View of the same, clearly showing the preferred detailed construction of the stuffing-box; and Fig. 3, a section takenr at the' line 3 on Fig. 1 and viewed in the direction of the arrow.

"A is a compressor, that shown comprising a cylinder B, containing the piston-chamber B and piston C therein, having the'rod C eX- tendingout through one end of the cylinder,V

ends yof which `and controlling communication with it of the compressor-chamber lare the spring-valves F and F', like vthe valves E and E', but opening outward withV relation to the chamber B. A discharge-pipe D2 is shown injFig. 3 as leading from thejpassageD.

About the piston-rod C', within the housing extension B2 of the compressoicylinder, I provide a stuing-box chamber, or, and preferably, two such chambers, as shown, or more than two. As shown, these chambers' are constructed as follows: At suitable intervals about the piston-rod C are provided the cupleathers r, v", and r2, clamped in place about their horizontal'portions by-metal ringsv p, je', and p2, thetwo latter of which are each considerablywider than the portion ofthe leather it covers to leave the spaces o and o', which communicate through passages o2, provided at intervals about each ring p' and p2, with circumferential recesses oin these two rings, which form, with the passages in them and spaces underneath them, the stuffing-box chambers G and G'.

The chamber G communicates through, a passage n with the suction-chamber D by way of the chamber of the valve E, and communication between the chamber Gand passage n is controlled by a valve H, presenting to the higher pressure in the stufiing-box chamber a smaller surface area U and to the lower pressure from the suction-chamberD a larger surface area c. The pressure in the chamber G is that of the gas which leaks into it about the piston and is much greater than that in the suction chamber. Vhen the pressure in the stuffing-box chamber against the smaller surface area u of the valve H equals that of the pressure from the suci ionchamber against the greater surface area 'v of that valve, the valve opens to let into the suction-chamber any excess of pressure in the chamber G above that to be retained constantly therein to resist the pressure from the compressor-chamber. Of course what that pressureis is predetermined, and the relative surface areas n and Q/ are provided accordingly to adapt the valve I'I to regulate the pressure in the stuffing-box chamber.

In the base of the chamber G' there leads a lubricant-supply pipe mfrom a pump., (not shown,) while from the opposite side of this chamber there leads a discharge-duct Z, normally closed bya valve Zin a chamber Z2 and fastened down against its seat by a screwplug Z3, having passages leading through it to the outer air, whereby on unscrewing the plug to raise the valve the lubricant may discharge and carry off with it any gas that may have entered the chamber Gfrom the chamber G. The pressure in the chamber G' is also rendered, bythe action of the pump in forcing into it the lubricant, more or less constant to resist leakage into it from the chamber G. Beyond the series of chambers G G may be provided a stuffing-box I of ordinary or any suitable construction to pack the chamber G against atmospheric pressure from without.

As will be seen, one stroke of the piston opens the valve E to admit the refrigerant from the chamber D into the compressorchamber, to be forced outv past the valve F' by the return stroke of the piston into the condenser, (not shown,) and this one (back) stroke of the piston forces out of the compressor-chamber past the valve F into said condenser the refrigerating medium which has been introduced into the compressorchamber from the suction-chamber D past the valve E by the forward stroke of the piston. However, the details of this construction relate only to one form of compressor for an ice or refrigerating machine provided with my improvement; but the latter may obviously be adapted, without departure from my` invention, to compressors ofVA other constructions for different purposes, wherein the excess of gas in the chamber G is caused to discharge elsewhere than into a suction-chamber or into asuction-chamber differently located from that shown.

What I claim as new, and desire to secure by Letters Patent, is

l. In combination with a gas-compressor, a stuffing-box chamber upon the piston-rod for receiving leakage-gas from the compressor,

and a regulating-valve controlling the outlet from said chamber and presenting thereto one face having a surface area smaller than that 4on its opposite face, substantially as and for the purpose set forth.

2. In combination with a gas-compressor, a stufing-box chamber upon the piston-rod for receivingleakage-gas from the compressor, a gas-chamber communicating with said stuffing-box chamber and having its gas contents at a lower pressure than'the pressure in said stuffing-box chamber, and a regulating-valve interposed between the two said chambers and presenting a smaller surface area to the stuffing-box chamber and a larger surface area to said gas-chamber, substantially as and for the purpose set forth.

3. In combination with a gas-compressor, a plurality of stuffing-box chambers upon the piston-rod'for receiving in succession leakage-gas from the compressor, a gas-chamber communicating with the stuffing-box cham- Iber next adjacent to the compressor andhav- =ing its gas contents at a lower pressure than the pressure in said stuffing-box chamber, anda regulating-valve interposed between the last-named stuffing-box chamber and said `gas-chamber and presenting to the former a smaller surface area and to the lattera larger surface area, substantially as and for the pur- -pose setV forth.

4. In combination with a gas-compressor, a

plurality of stuffing-box chambers upon the piston-rod for receiving in succession leakagegas from the compressor, a gas-chamber communicating with the first stuffing-box chamber, or that next adjacent to the compressor, and having its gas contents at a lower pressure than the pressure in saidfstufiing-box chamber, a regulatingvalve interposed between the last-named stuffing-box chamber y and said gas-chamber and presenting to the former a smaller surface area and to the latter a larger surface area, and a lubricant-supply pipe leading into the second stuffing-box chamber, substantially as and for the purpose set forth.

5. In combination with the compressor and suction-chamber of anice or refrigerating machine, a stuffing-box chamber on the pistonrod for receiving leakage-gas from the lcompressor andcomm unicatin g with said suctionchamber, and a regulating-valve interposed in the communication between said stuffingboX chamber and said suction-chamber and IOO IIO

presenting a lesser surface area to the former and a greater surface area to the latter, substantially as and for the purpose set forth.

6. In an ice 0r refrgerating machine, the

combination With the compressor of a suctionchamber I) part Way surrounding the compressor-chamber B, Valves E, E and F, F', a stuiing-box chamber G 0n the piston-rod, a passage n between said chamber G and the chamber of the valve E, and a valve II interposed in said passage and presenting a smaller surface area to the stuffing-box chamber and a larger surface area to the pressure from said suction-chamber, substantially as and for the purpose set forth.

'7. In an ice or refrigerating machine, the 

